We know nothing about "immune-cell activity in mammals." We merely know that the extracts made by MUSHROOMS prevent tumors not by killing cancer cells directly, but by increasing immune-cell activity. What immune cell activity does in a mammal is not discussed in the passage. Therefore, we cannot state that answer choice (D) must be true.

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Dhishalon September 6, 2018

Why isn't the answer A? Why is the answer C?

Ryanon June 23 at 12:16AM

A says no benefit at all from eating wood, but the passage just says can't make glucose, there may be many benefits of eating wood other than glucose, like fiber content.

We know from the stimulus that mammals cannot digest cellulose, butthis does not mean that the mammals do not get health benefits fromconsuming it. It's possible that cellulose could aid in cleaning outthe digestive tract or do some other beneficial function. Thus, (A) isout.

(C) says, "The greater the degree of branching of beta-glucans, thegreater the degree of immune-cell activity it triggers in mammals."

The stimulus told us that more branching means more anti-tumoractivity. Additionally, we now that beta-glucan's anti-tumormechanisms involve the stimulation of immune cell activity. Thus, it'slikely that more branching means more immune-cell activity. This iswhy (C) is the correct answer choice.

Does this make sense? Let us know if you have any other questions!

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